The Resonance Synchronization Index (RSIx): A Planetary Geometry-Modulated Framework for Forecasting Elevated Magnetospheric Coupling Windows

RSIx is a planetary-geometry timing framework evaluated on OMNI data from July to September 2025 with prospectively issued windows. Forecast windows concentrate southward Bz, higher AE, and increased Kp incidence, with the strongest enrichment in early September. Historical regimes from 1970 to 2023 provide context. Proprietary calibration remains confidential. 

Keywords

heliospheric current sheet, IMF Bz, AE index, Kp, sector boundary, planetary ephemris, extended-range forecasting, space weather